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acotyledon

[ey-kot-l-eed-n, ey-kot-]
noun
  1. a plant without cotyledons, therefore one belonging to a group lower than the seed plants.
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Origin of acotyledon

First recorded in 1810–20; a-6 + cotyledon
Related formsa·cot·y·le·don·ous [ey-kot-l-eed-n-uh s, ey-kot-] /ˈeɪˌkɒt lˈid n əs, eɪˌkɒt-/, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for acotyledon

acotyledon

noun
  1. any plant, such as a fern or moss, that does not possess cotyledons
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Derived Formsacotyledonous, adjective
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012